@grid-columns: 24;
@grid-gutter-width: 0;

.make-row(@gutter: @grid-gutter-width) {
    position: relative;
    margin-left: (@gutter / -2);
    margin-right: (@gutter / -2);
    height: auto;
    // .clearfix;
}

.float-grid-columns(@class) {
    .col(@index) { // initial
        @item: ~".col-span@{class}-@{index}";
        .col((@index + 1), @item);
    }
    .col(@index, @list) when (@index =< @grid-columns) { // general
        @item: ~".col-span@{class}-@{index}";
        .col((@index + 1), ~"@{list}, @{item}");
    }
    // .col(@index, @list) when (@index > @grid-columns) { // terminal
    //     @{list} {
    //         float: left;
    //         flex: 0 0 auto;
    //     }
    // }
    .col(1); // kickstart it
}

.loop-grid-columns(@index, @class) when (@index > 0) {
    .col-span@{class}-@{index} {
        
        width: percentage((@index / @grid-columns));
    }
    // .col@{class}-push-@{index} {
    //     left: percentage((@index / @grid-columns));
    // }
    // .col@{class}-pull-@{index} {
    //     right: percentage((@index / @grid-columns));
    // }
    .col@{class}-offset-@{index} {
        margin-left: percentage((@index / @grid-columns));
    }
    .col@{class}-order-@{index} {
        order: @index;
    }
    .loop-grid-columns((@index - 1), @class);
}

.loop-grid-columns(@index, @class) when (@index = 0) {
    .col-span@{class}-@{index} {
        display: none;
    }
    .col@{class}-push-@{index} {
        left: auto;
    }
    .col@{class}-pull-@{index} {
        right: auto;
    }
}

.make-grid(@class: ~'') {
    .span {
        float: left;
        display: block;
    }
    .float-grid-columns(@class);
    .loop-grid-columns(@grid-columns, @class);
}

.bs-row {
    .make-row();
    .make-grid();
}